Rock-drill.



.L Ci WREGHT. ROCK DRILL.

APPLICATION FILED MAR-8 .19l6.

Patented Mar. 6, 1917. v

3 SHEETS-SHEET 1 J. C. WREGHT.

ROCK DRILL.

APPLICATION FILED MAR. a. 1916.

Patented Mar. 6, 1917.

3 SHEETS-SHEET 2.

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ROCK DRILL.

APPLlCATlON FILED MAR. a. 1916.

Paterited Mar. 6,1917.

s SHEETSSHEET 3.

UNITED. STATES PATENT OFFICE.

JAMES C; WRIGHT, OF COLORA DO SPR INGS, COLORADO, ASSIGNOR' OF ONE-HALF TO I r. L. RIPPEY, or DALLAS, 'rnxas.

.. ROCK-DRILL.

Specification of Letters m Patented Mar. 6, 1917.

Application filed March 8, 1916. Serial No. 82,984. I

To all whom it may-concern: Be it'known that JAMES C. WRIGHT, a

citizen of the United States, residing at 5155' \Vest Monument street, Colorado Springs, in the county of El Paso and State of Colorado, have invented certain new and useful Improvements in Rock-Drills, of which the following is a specification My invention relates to certain new and. useful improvements in rock drills and per-- tains more particularly to that type having an automatic feed mechanism, the primary aim being to provide such a machine in which the feed is controlled or governed by the hammer.

Certain mechanical feeds heretofore used bit is being jammed, and, when the bit is I rotating means which will yield or freed, the automatic feed will resume its operation. v The invention, further, comp r1ses means for automatically changing the hammer blow from a heavy to a light one, when the bit is being jammed, this being accomplished by theshortening .of the hammer stroke.

Anotheraim resides in an improvedchuck when the bit isunduly resisted.

The invention further resides in an im-. proved support for the drill and also in the features of construction, arrangements and combinations of parts hereinafter described and claimed, reference being had to the accompanying drawings wherein like characters of reference designate corresponding .v qrparts throughout the several which j ,Figure 1 is a side elevation of my improved rock drill; Fig. 2 is an elevation of the chuck end of the drill the parts in, front of the ratchet being removed to clear the view thereof;

I gig. 3 is a similar view of the opposite of the machine; Fig. 4 shows inlongitudmal' verticalsection the interior workings of the mechanlsm;

Fig. 5 is a transverse section on line I removed.

' In the forward part of the casing, the bit. chuck 17 is rotatably disposed and provided'f 'i" of Fig. 1 through the chuck rotating mech anism;

Fig. 6 is a similar view on line 6'-6 of Fig. 1 showing the hammer actuating cams;

Fig. 7 is a side elevation of my improved support. on-which I prefer to mount the drill; and

F1g. 8 is a section through thesocket, the viewbeing taken on line'8'8 of Fig. 1.

The casing 1 of the drill isprovided with a chamber 2 in which reciprocates the hammer 3. The shank or stem 4 of the hammer extends rearwardly through the casing and its removable head 5 between which and nuts 6, threaded on the extremity of the shank 4 coils a cushion spring 7. Within the cas1ng, the shank is formed with a extending lugs 10 which are held by spring '9 against the active-facesof the cams 11,

said cams being spaced to receive the shank therebetween (Fig. 6) and are fixed on a transverse shaft 12 journaled in and extending at each end from the casing. On

one projecting end of the shaft is a gear 13 meshing with a larger drive gear 14.- which is fixed on a secondshaft 15 j ournaled in the casing.

Each end of this second shaft 15 carries. a removable and adjustable handle 16 so that should it be necessary to operate close to a wall, the handle on that side may be I with a ratchet 18 and a suitable water su ply 19 for cleanin the bit 20. Arranged 1n able against the bit byvbeing struck by; the

hammer and retained Within its chamber by 4 the inner end of t e chuck is a pin 21 slidpivoted t,d ca 3 connected at i one ,end'to .thecarrf hr and ha's'its opposite en'd'f slotted at 0 170 jslidably receive a strap blockr,

.riage.

eccentric-Q32,

in a suitablebracket extension 47 of the car- Fixed on the shaft section 46 is a ratchet 48 retained against reverse rotation bya spring actuated pawl 49.

Asupporting link 50, swingingly disposed on shaft 46, pivotally carries ahooked f" pawlzol which engages with the ratchet 48 and is provided with an arm or'lug 52 eX- ftending beneath the'c arriage. A spring 53 hammer back "a a spring 19 sothat; when, t

j the percussion pin 21 which transmits the spring blow to the bit. tTliefhammeris cushioned at the terminations'of its actives'troke by the Duringfthisl operation, the eccentric 32- oscillates, the section 27 of lever 27 and,

, through lever section 27",creciprocates the 25 carrier 25 to intermittently rotate the drill chuck. Each lever section is pivotedto the pin 29 and has a depending fi nger 35. An

expansion spring 36jconnects the fingers 35 to normally constitute an operative connection between the lever sections whereby, should'the drill stick, the spring willyield to prevent ,thechuckfrom rotating. Thus,

in effect, lever 27 is a breakable drive between the e'cce'ntric'and carrier;

The casing 1 s formed th a depending,

invert ed 'T sh'aped web 37 slidabl y arranged in the'track grooves 38 of a channeled base 39i A feeding screw 40 is journale'id 'inthe hase and engages with a nut part 41*depend- 40 ing, from the web 37 whereby on rotating the feed screw the drill casing or carriage 1 will slide in the tracks 38.

Although the feed of the drill' carriage may be accomplished by manually rotating the screw shaft 40, with the crank handle 42, I prefer to make the feed automatic. Certain mechanical feeds continue to operate, when the bit is jammed and inoperative, causing great damage and injury to the mahine. This defective feed is due, in part to the fact that the hammer in no way enters into the feed operation.

By my invention, the hammer controls the feed of the drill carriage and when the stroke of the hammer is not full or complete the feed mechanism is allowed to remain at rest.

On the screw shaft 40 is fixed a gear 43 which meshes with a gear 44 fixed to one section 45 of an extension shaft. This shaft section is journaled on the base and telescopically receives the component shaft section 46 which is splined or otherwise secured thereto for relative sliding movement only. This second shaft section is journaled re ljving; slide the I ill St fthQ 1:. he "lugs: 10 ride 'i'ofiE v the cams at points 34-the compressed springq will immediately force theha-mm'er against a '64 on the base 39.

normally hol ds the pawl 51 engaged with the ratcl1et, depression of the arm 52, and the consequent rotationof the ratchet, be-

ling etfected by a-blade-like trip 54 which isfixedtothe hammer, as at 55. The ext rem e forward end of the trip is formed ivi th a cam edge 56;to'ride and depress the arm The fe'e dlis geared to advance the carriage at ra-greater speed than "the bit will operate. 1

I 'From'Ifig. 4, it will-,be noted that the trip 9 54 'does not operatel funtil almost the very end of the hammer stroke is reached.

Therefore, if the bit is-jammed or the carriage is advanced thereon, the pin 21 will be pushed toward the hammer by the bit,

and the hammer stroke will be shortened improved drill is depicted in side elevation in Fig. 7 and comprises a tubular body 57 having, a foot 58 at one end and a cross head 59 fixed at its opposite end, the ends of the cross head each having a pivotal nut 60 through which is threaded adjusting and setting screws 61.

These screws may be operated in any suitable manner and carry swivel bearing blocks 62.

Adjustably .fixed on the body 57 is a socket 63 which receives a depending stud The socket is formed with a slot 65 through which passes a screw bolt 66. This bolt is carried by an arcuate plate 67 whose inner face is serrated to firmly grip the socket when the bolt is tightened, the latter being threaded in the base stud as illustratedin Fi 8. After the support 57 as'been positioned between opposing walls, as in a mine, the drill may then be angularly adjusted to any desired position which is maintained by tightening screw bolt 66 to clamp the stud 64 to the socket. The drill is then ready for operation.

The drill is entirely automatic the operator only supplying the motive power. If

limited degree.

a base, of a carriage arranged to slide upon a the base, a threaded shaft engaging the carriage for feeding the carriage, a hammer, a bit movably supported bythe carriage in the path of the hammer, means'for operat-' ing the hammer, a telescopic shaft arranged parallel with the said threaded'shaft, gear mg connecting the said telescopic and threaded shafts at the rear ofthe base, a ratchet and pawl device arranged at the forward end of the base beyond the path, of the body of the hammer for operating "the telescopic shaft, and a memberv carried by the hammer and projecting from thehams mer for operating the said ratchet-and paw] device by the forward movement ofthe hammer.

2. In a rock drill, the-combination with a.

base, of a carriage arranged to slide upon-- the base, a threaded shaft arranged longitudinally within the base below the carriage and engaging the carriage for feeding the carriage, a hammer, a bit movably supported by the carriage in the path of the hammer, means for operating the hammer, a telescopic shaft arranged upon one side of the base and parallel with thesaid threaded shaft, means for transmitting the rotary movement of the said telescopic shaft to the said threaded shaft, a ratchet upon the said telescopic shaft, a pawl engaging the said ratchet and arranged at the forward'end of the base beyond the path of the hammer for y rotating the said telescopic shaft, and a trip arm connected with the lower side of the hammer and projecting forwardly beyond the hammer, the said pawl havlng a portion arranged to engage. the said trip arm whereby the said pawl and ratchet are operated and the said telescopic shaft is rotated.

3. In a drill, a base, a threaded shaft j ournaled thereon, a second shaft journaled on the base and gearing with the first shaft, a

carriage, a bit carried by the carriage, a hammer for actuating the bit, a shaft journaled on the carriage and slidably connected to the second shaft for rotating the latter, a ratchet fixed on the third shaft, a movable pawl engaged with the ratchet for intermittently 'rotating the same, and a trip carried by the hammer to move the pawl.

4. In a rock drill, the comb nation with a base, of a carriage sliding thereon, a longitudinally movable hammer upon the carriage, means for operating the hammer, a

threaded carriage-feeding shaft and a telescopic shaft extending parallel with the axisof' the hammer, the said threaded shaft engaging the carriage, means connecting the said shafts whereby therotation of one is communicated to the other, shaft-rotating devices borne by the said base and the said.

telescopic shaft and arranged to act upon the said telescopic shaft, and a member moved by the hammer whereby the said shaft-rotating devices are engaged and operated. y

In testimony whereof I afiix my signature in the presence of two witnesses.

JAMES C. WRIGHT.

Witnesses l E. Jones, W. H. Dmrs. 

